4245-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4245, an AS568-245 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 4.359 in (110.72 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.637 in (117.78 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

The material holds up against petroleum-based oils, many alcohols, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or strong acids are present. The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

Maintenance and OEM teams specify it across general industrial maintenance, fluid power, and construction equipment.

Order part number HQ4245, sold individually. Nominal inside diameter is listed as 4 3/8 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.